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What Welding Defects Easily Appear at the Key Connection Points on Both Sides When Welding a Seat Recliner with a Dual-Head Projection Welder?

Sep 27,2026

The automotive seat recliner is a core safety component for seat load-bearing and angle adjustment. A dual-head projection welder for seat recliners can complete left and right point welding in one operation with high production efficiency. However, once pressure, current, or electrode conditions are asymmetric on the two sides, various welding defects easily occur.

I One-Sided Cold Joint, Inconsistent Weld-Spot Strength on Both Sides

Welding energy or pressure is unbalanced between left and right sides, resulting in large strength differences between the two points.

II Projection Points Pressed Flat Without Solid Fusion

Insufficient welding pressure or improper heat-input matching presses the projection points flat without forming effective nuggets.

III Spatter, Workpiece Surface Ablation and Blackening

Excessively large instantaneous heat input rapidly melts the projection points; molten metal is squeezed and flung out as spatter; burn marks and blackening appear on the workpiece surface.

IV Weld-Spot Offset and One-Sided Poor Fusion

Coaxiality deviation between the two-side electrodes shifts the nugget toward one side of the plate, forming only one-sided fusion and significantly reducing the load-bearing capacity of the weld spot.

V Excessively Deep Indentations and Workpiece Collapse

Excessively high welding pressure, or plate softening at high temperature, causes excessively deep indentations at the weld spot and local workpiece collapse.

VI Positioning Offset Causing Misaligned Welding

Excessive tooling positioning clearance or improper workpiece placement causes misalignment between projection points and electrodes.

VII Electrode Material Sticking and End-Face Deformation

Molten metal adheres to electrode end faces at welding high temperature, forming material sticking; long-term use causes electrode end-face wear and deformation, further aggravating inconsistent welding conditions on the two sides.

Wuxi Haifei Intelligent Equipment Co., Ltd. https://www.haifeiwelder.com/

Wuxi Haifei Intelligent Equipment Co., Ltd. has been focusing on the R&D and production of special‑purpose welding machines for 17 years. The company has obtained ISO9001 Quality Management System Certification, China Compulsory Certification (3C) and CE Certification. It is a National High‑tech Enterprise, a Specialized, Refined, Differential and Innovative Enterprise of Jiangsu Province, a Specialized, Refined, Differential and Innovative Enterprise of Wuxi, and a Gazelle Enterprise in the Southern Jiangsu National Self‑Dependent Innovation Demonstration Zone.

Should you be interested in our special‑purpose machines, please contact us: 400‑0510‑750.